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About Robert Cummings, P.E.
(Top Expert on this page)

Expertise
I can answer questions related to rock blasting, rock and soil excavation (such as tunnels and highway cuts), stability of such excavations, and foundations in rock and soil. I can also answer questions related to geology and mining.

Experience
30+ years as a geotechnical engineer and minerals engineer. Active consulting practice in rock blasting, geotechnical engineering, and rock mechanics for mining and heavy construction.

Organizations
Society of Mining Engineers, Deep Foundations Institute, Association of Engineering Geologists, and International Society of Explosives Engineers.

Publications
Mining Engineering, AEG Bulletin.

Education/Credentials
BS and MS Geological Engineering

   

You are here:  Experts > Education > Votech Education > Construction & Contractors

SubjectDate AskedExpert

Insulating Cinderblocks in a Baserment11/30/2008Joe Turner
  Q: I recently finished out a basement but didn't frame out the cinderblocks that made the walk-out part ...
  A: It is likely that at this point the perlite might not completely penetrate throughout the spaces in ...
Closing before completion of home11/23/2008Brian McElroy
  Q: Mr McElroy, thank you in advance for your help. My contractor has taken over 9 months to complete ...
  A: You need to contact a construction lawyer. Chances are he will never finish the roof. Until the ...
pan deck construction11/22/2008Robert Cummings, P.E.
  Q: I'm trying to learn more about pan decks for a residential garage on a sloped lot. Is this a common ...
  A: If I understand you right, you think perhaps the use of pan decking rather than another floor method ...
slight marble crack11/17/2008Jim Lyon
  Q: I have a tiled floor that is surrounded by the standard 4 inch wide marble surround. Lately, I've ...
  A: There is a technique you can try to fill the crack. If it doesnt work, the piece could be replaced. ...
rock blasting and our well11/14/2008Robert Cummings, P.E.
  Q: We live in a rural area on 16 acres of a very rocky hillside. Our neighbours have blasted an ...
  A: It would be highly unusual, if not impossible, for blasting to cause a well to "run dry" that was ...
fence poles in lava rock11/13/2008Robert Cummings, P.E.
  Q: only thing is that the property is in Hawaii and it is on the slope of a volcano so I need a easy ...
  A: First of all I wonder why it takes 200 holes to fence a 1/2 acre lot with chain link. According to ...
faux stone over marble11/10/2008Jim Lyon
  Q: Can u put faux stone directly on marble, or do you have to take off the marble? this is on a ...
  A: This should work without a problem, assuming that the marble is properly adhered to whatever is ...
Sump pit11/8/2008David Coil/C. R. Construction
  Q: I recently had a flood in my basement apartment. I had to remove the panel and take a look at what ...
  A: Dave here...I hope you sent the question where you wanted it to go...a sump pit area is quite ...
weight bearing capacity of cement11/7/2008Brian McElroy
  Q: In Cancun Mexico, we are pouring a concrete pad on which to put an above ground swimming pool. Does ...
  A: Yes, concrete has little strength without steel. Use wire mesh if the slab is 4" or less. If more ...
particle board cupboards11/2/2008Michael Hughes
  Q: Our contractor recently put particle board cupboards in our unheated cottage. We thought we were ...
  A: I imagine the cabinets are MDF (medium density fiberboard). Most cabinets that are manufactured ( ...
Small Housing Development10/31/2008Lee Kilcup
  Q: Rural Area...500 to 750 sq.ft. houses...one to two occupants...25 houses in sud-division MyOn site ...
  A: I am not a civil engineer but know a little about these things. If the soils are acceptable the ...
Roofing Shingles Reaeling10/27/2008David Coil/C. R. Construction
  Q: Hurricane IKE blew thru the Galveston-Houston area in Sept 08. Insurance adjusters are telling ...
  A: If the seal tab pulled up...and separated from the shingle below...but in the process pulled part of ...
construction defects/2-10 warranty10/18/2008Joe Turner
  Q: We live in our nearly 5 yr. old custom built home. Since year #1 we have had residual problems ...
  A: This is all too common. The expansive soils should have been stabilized by the builder. There are a ...
submittals10/18/2008Lee Kilcup
  Q: I am translating a building contract from English, and I can not find the meaning of "submittal" ...
  A: Submittals are product information (data) that is collected and sent to the designer for approval to ...
rock/cement covering inside house10/14/2008Robert Cummings, P.E.
  Q: My house was built about 30 years ago on rock. There is a room inside my house that has cement ...
  A: By cement I presume you mean concrete, although it really does not matter. The answer is yes, you ...
standard rate of work on concreting slab10/13/2008Lee Kilcup
  Q: Can i ask you if how many days can a 1 hectare land be concreted with how many men? thank you in ...
  A: There are many variables: Is the slab on grade or suspended? What type of finish is there? Hard ...
How long after a project is finished can the contractor bill us?10/12/2008Jim Lyon
  Q: We had a addition completed to our home several months ago. The last invoice we paid was in March, ...
  A: just following up and I wondered how things are going closing out your project? Thanks, Jim Hi I ...
Concrete slab cracks10/6/2008Joe Turner
  Q: My husband and I bought our home a little over 6 years ago and have been having several problems ...
  A: A crack in the slab that has offset - one side higher than the other - is a defect and is subject to ...
trencing with boulder buster10/1/2008Robert Cummings, P.E.
  Q: Good day Mnr. Cummings the Boulder Buster works wonders with loose boulders,but i need to blast a ...
  A: When you say 1.5 meter trench I assume you are talking about the depth, not the width because you ...
bathroom window9/28/2008Jim Lyon
  Q: I want to cover over the bath room window with the surround in the shower. but not take it out. It ...
  A: Its funny, this is the first project I ever handled many years ago and I did a terrible job. Let me ...
Concrete Slab for Room Addition9/24/2008David Coil/C. R. Construction
  Q: We live in Albuquerque NM which has very low humidity. This past weekend we had a monolithic slab ...
  A: It was poured too wet. Too much water causes more shrinkage. They are only surface fissures....and ...
bait and switch bid by plumber9/23/2008Jim Lyon
  Q: We hired a plumber to do the finish plumbing in an unfinished basement. It was all roughed in by the ...
  A: First let me stress that I am not a lawyer and my opinion is strictly based on my very limited ...
concrete load capacity9/23/2008Lee Kilcup
  Q: Lee, I live in a 5 story 24 unit villa building built in 2003. It is made of steel and concrete, ...
  A: Generally buildings are designed with a live load of 75 psf to 100 psf (pounds per square foot). ...
concrete porch9/21/2008Robert Cummings, P.E.
  Q: We would like to add a layer of concrete to an existing porch. The structure is in good condition. ...
  A: Do not add new concrete unless the surface it is to bond to is clean concrete and treated with a ...
verbal contract9/21/2008Jim Lyon
  Q: I had a verbal contact to stain concrete floors for a friend. I was only charging $1500. She ...
  A: I would suggest that you talk with someone you both trust to act as an impartial party and to try to ...
Retaining wall9/20/2008Robert Cummings, P.E.
  Q: My house is on a slope and was built 40 years ago. We moved in 10 years ago, and the concrete ...
  A: It gives me a much better idea of what you are dealing with. Apparently, the retaining wall must ...
ledge blasting9/20/2008Robert Cummings, P.E.
  Q: is it possible to break up ledge using a high pressure water jet rather than explosive charges ?
  A: That all depends on the hardness of the rock, the prevalence of fracturing, and the intensity of the ...
Explosive operations in Texas9/19/2008Brian McElroy
  Q: Sir, I work for small Environmental company that does ordnance remediation at Formerly Used Defense ...
  A: You probably need to contact teh State of Texas in Austin. They have a Department that handles any ...
New Construction -Foundation wall collapse9/17/2008Joe Turner
  Q: I am the homeowner and GC of this project. New 10 inch poured concrete foundation wall in July 2008, ...
  A: Your contractor is nuts or dishonest. He took the contract to build the wall to code - that is ...
Groundwater control9/12/2008Robert Cummings, P.E.
  Q: The site in Anacorets WA has a pit where shallow , seasonal, groundwater stands at a depth of ...
  A: You may be misinterpreting the geotechnical recommendations. My guess is that the sheet piling was ...
Taking out window and boarding up hole9/8/2008Jim Lyon
  Q: I have a bathroom window that is approx. 6 feet wide and 5 feet tall. I would like to take the ...
  A: This is not too hard of a project. I am making the assumption that you have a wood frame house with ...
concrete slab thickness9/4/2008Brian McElroy
  Q: I am canstucting a concrete slab to to provide a base for a Generator (weight 1373 kg). I plan to us ...
  A: That should be fine. If it is a Propane or Natural Gas fired unit, make sure you leave at least 6 ...
drop ceilings9/3/2008Lee Kilcup
  Q: i have someone that wants me to bid a job. i am use to working by the hour. anytime i bid something ...
  A: You may be able to make more money by bidding the work. I would carefully track my productivity ...
Billing after the job is completed9/3/2008Jim Lyon
  Q: We hired a contractor to do a new roof, siding, all new windows and to demolish our old front porch ...
  A: These kinds of problems can be very upsetting and are easily avoided if the contractor takes the ...
method to dig and break rocks with excavator9/1/2008Robert Cummings, P.E.
  Q: I'm looking for some method to dig and break rocks with excavator.Do you have some knowledge of this ...
  A: Depending on the size of the excacvator, there are attachments that will either break rocks directly ...
excavating and backfilling8/30/2008Robert Cummings, P.E.
  Q: I am contemplating putting an addition onto my home using a cargo shipping container (20'X8'X8.5'). ...
  A: Most wet sand-silt-gravel mixes will weigh in the neighborhood of 135 pcf if compacted and 125 pcf ...
Pay basis for remodeling employees8/29/2008Lee Kilcup
  Q: I run a small remodeling business with 8 field employees and would like to find a way to tie ...
  A: We provide our employees yearly bonus that equals about 25% of my profits. Since we started doing ...
Vibration Monitoring8/28/2008Robert Cummings, P.E.
  Q: I am an Environmental Officer working for construction company and responsible for vibration ...
  A: I can see why you are confused about the vibration specification. From what you sent it looks like ...
Travertine on pool deck8/27/2008Joe Turner
  Q: We are considering installing 2" travertine in sand over a concrete pool deck. This is in NJ. Is ...
  A: The only problem is the freeze/thaw cycle where you live (I am assuming northern NJ). If water gets ...
Retaining wall8/24/2008Robert Cummings, P.E.
  Q: My house is on a slope and was built 40 years ago. We moved in 10 years ago, and the concrete ...
  A: I don't know that I have ever heard of a wooden retaining wall. I am familiar with soldier pile ...

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Questions by
Active Experts:
Brian McElroyRobert Cummings, P.E.Tad Dixon
Mathew KoshyLee KilcupDavid Coil/C. R. Construction
Michael HughesSylvan TiegerJoe Turner
Jim Lyon  

     
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